Zobrazeno 1 - 10
of 24
pro vyhledávání: '"André Bojahr"'
Autor:
Daniel Schick, Marc Herzog, André Bojahr, Wolfram Leitenberger, Andreas Hertwig, Roman Shayduk, Matias Bargheer
Publikováno v:
Structural Dynamics, Vol 1, Iss 6, Pp 064501-064501-13 (2014)
Using ultrafast X-ray diffraction, we study the coherent picosecond lattice dynamics of photoexcited thin films in the two limiting cases, where the photoinduced stress profile decays on a length scale larger and smaller than the film thickness. We s
Externí odkaz:
https://doaj.org/article/cbb55b4e73924f5b9fd5e38e859d048d
Publikováno v:
Ultrasonics. 56:148-152
We use broadband time domain Brillouin scattering to observe coherently generated phonon modes in bulk and nanolayered samples. We transform the measured transients into a frequency-wavevector diagram and compare the resulting dispersion relations to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1eb7bc9325f41db996d7e2a3b2c190be
https://doi.org/10.1016/j.ultras.2014.08.023
https://doi.org/10.1016/j.ultras.2014.08.023
Publikováno v:
physica status solidi (b). 251:821-828
Wavevector-selective impulsive excitation of phonon-polaritons by a spectrally broad femtosecond transient grating produces wavepackets propagating in opposite directions. The photons in spectrally narrow probe pulses are scattered from these element
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c37037d28acddad12e07cd889b9be400
https://doi.org/10.1002/pssb.201350114
https://doi.org/10.1002/pssb.201350114
Autor:
Roman Shayduk, Matias Bargheer, Peter Gaal, Clemens von Korff Schmising, Daniel Schick, Marc Herzog, André Bojahr
Publikováno v:
Journal of Applied Crystallography. 46:1372-1377
A diffractometer setup is presented, based on a laser-driven plasma X-ray source for reciprocal-space mapping with femtosecond temporal resolution. In order to map out the reciprocal space, an X-ray optic with a convergent beam is used with an X-ray
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::377da9a4514afae97a0437a3e421693a
https://doi.org/10.1107/s0021889813020013
https://doi.org/10.1107/s0021889813020013
Autor:
M. Rössle, André Bojahr, Matias Bargheer, Flavio Zamponi, Elena Sergeevna Pavlenko, Mathias Sander, J.-E. Pudell, Steffen Mitzscherling
We introduce azobenzene-functionalized polyelectrolyte multilayers as efficient, inexpensive optoacoustic transducers for hyper-sound strain waves in the GHz range. By picosecond transient reflectivity measurements we study the creation of nanoscale
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70501c7d2a1ef191d85da1840c9b2b51
http://www.helmholtz-berlin.de/pubbin/oai_publication?VT=1&ID=91406
http://www.helmholtz-berlin.de/pubbin/oai_publication?VT=1&ID=91406
Publikováno v:
Physical Review Letters. 114
We study the linear and nonlinear acoustic response of ${\mathrm{SrTiO}}_{3}$ across its ferroelastic transition at ${T}_{a}=105\text{ }\text{ }\mathrm{K}$ by time domain Brillouin scattering. Above ${T}_{a}$ we observe that for a strain amplitude of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cbfff0efe71f99bae677802692870904
https://doi.org/10.1103/physrevlett.114.047401
https://doi.org/10.1103/physrevlett.114.047401
Autor:
Wolfram Leitenberger, Peter Gaal, Matthias Reinhardt, André Bojahr, A. von Reppert, Matias Bargheer, M. Roessle, Matthias Gohlke, J.-E. Pudell, Mathias Sander
Phonons are often regarded as delocalized quasiparticles with certain energy and momentum. The anharmonic interaction of phonons determines macroscopic properties of the solid, such as thermal expansion or thermal conductivity, and a detailed underst
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::542770b41c55a82244186b783d185ca1
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/38451
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/38451
Autor:
Daniel Schick, André Bojahr, Marc Herzog, Roman Shayduk, C. von Korff Schmising, Matias Bargheer
Publikováno v:
Computer Physics Communications
The UDKM1DSIM toolbox is a collection of MATLAB (MathWorks Inc.) classes and routines to simulate the structural dynamics and the according X-ray diffraction response in one-dimensional crystalline sample structures upon an arbitrary time-dependent e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4971781a63461c3025da4dd6a84516a2
https://hdl.handle.net/11858/00-001M-0000-0019-91AE-121.11116/0000-0005-4A9C-911858/00-001M-0000-0014-B4CC-F
https://hdl.handle.net/11858/00-001M-0000-0019-91AE-121.11116/0000-0005-4A9C-911858/00-001M-0000-0014-B4CC-F
Autor:
Michael Wulff, Wolfram Leitenberger, Ionela Vrejoiu, Matias Bargheer, Peter Gaal, Dmitry Khakhulin, André Bojahr, Roman Shayduk, Daniel Schick, Jevgeni Goldshteyn, Marc Herzog
Publikováno v:
Journal of synchrotron radiation. 21(Pt 2)
A new concept for shortening hard X-ray pulses emitted from a third-generation synchrotron source down to few picoseconds is presented. The device, called the PicoSwitch, exploits the dynamics of coherent acoustic phonons in a photo-excited thin film
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::316516dfafd26ed71bdc494c2b160496
https://pubmed.ncbi.nlm.nih.gov/24562559
https://pubmed.ncbi.nlm.nih.gov/24562559
Autor:
Peter Gaal, Mathias Sander, Daniel Schick, André Bojahr, Hengameh Navirian, Marc Herzog, Roman Shayduk, Ionela Vrejoiu, Matias Bargheer, Wolfram Leitenberger, J. Goldshteyn
We synthesize sub-THz longitudinal quasimonochromatic acoustic phonons in a SrTiO${}_{3}$ single crystal using a SrRuO${}_{3}$/SrTiO${}_{3}$ superlattice as an optical-acoustic transducer. The generated acoustic phonon spectrum is determined using ul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a09dcbeadc9d98c17e5966d3e849e7d
http://arxiv.org/abs/1303.5643
http://arxiv.org/abs/1303.5643